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R.N. 70269/98
ISSN : 0972-169X
June 2013
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Postal Registration No.: DL-SW-1/4082/12-14
Date of posting: 26-27 of advance month
Date of publication: 24 of advance month
Vol. 15
No. 9
rth
a
tE
Rs. 5.00
Damodar Dharmanand
Kosambi
(A Scientist with Renaissance Versatility)
A Chronicle
of Cryptography
(1907-1966)
Editorial: Sector-specific and crosssectoral science and technology
information support ...
39
38
Damodar Dharmanand Kosambi: A
Scientist with Renaissance Versatility
A Chronicle of Cryptography
35
Interview with Anthony James Legget 31
Water Footprint and Virtual Water –
Emerging Concepts in Water
Management
30
Benign Prostate Enlargement—
Weighing the Treatment Options
27
Recent developments
in science and technology
25
VP News
22
Editorial
Sector-specific and cross-sectoral science and
technology information support and
capacity building interventions
Dr. R. Gopichandran
A
recent working paper from the Madras school of
Economics (Sankar U, 2012) highlighted the need to
establish knowledge sharing synergies between scientists and
economists. This was with special reference to aspects of
sustainable development that have to be mainstreamed into
public policy frameworks. The author draws attention to
Amartya Sen’s deliberation on scientific temper integrating
logic, reason and notions that are not biased/pre-conceived.
He further refers to Pandit Jawarharlal Nehru’s perspective on
scientific temper. In this context an important reference to
four important indicators of economic growth as a function
of technical progress sets the context for specific science and
technology interventions. They include higher production
aligned with efficient appropriate material and energy inputoutput proportions and discovery/use of alternative materials
and production systems. These aspects are integral also to
eco-industrial development.
Importantly, principles of preventive environmental
management are embedded in such perspectives and can
help fulfil immediate goals set by the various sector-specific
missions of our country for the present 12th Plan period as
a priority. Citizens as consumers of products and services
can influence sustainable production and consumption and
help reduce the spread and depth of externalities. Sankar (op.
cit) accordingly reinforces the need for cross sectoral linkages
based on a clear understanding of challenges and options
to overcome them. A recent working paper by Bryant
and Goodman (2013) provides interesting insights on the
dynamics of involving citizens in sustainable production
and consumption practices. The need to deliver appropriate
scientific and technical information to assist well adapted
public policies that will assist large scale transitions is
Editor
: Subodh Mahanti
Associate editor : Rintu Nath
Production
: Manish Mohan Gore and Pradeep Kumar
Expert member : Biman Basu
Address for
correspondence :
39
Vigyan Prasar, C-24,
Qutab Institutional Area, New Delhi-110 016
Tel : 011-26967532; Fax : 0120-2404437
e-mail : info@vigyanprasar.gov.in
website : http://www.vigyanprasar.gov.in
highlighted also by the James A Baker III Institute of Public
Policy (2013) of the Rice University.
Michael Clegg (2012) the Co-Chair of Inter-American
Network of Academies of Science recently defined the unique
values of science and scientific approach duly recognising its
pervasive nature across thrust areas relevant for sustainable
development. In this context he rightly highlighted
scientific temper as a means of enhancing tolerance and
rationality. These attributes of understanding world views
of development will help citizens comprehend emerging and
continually evolving facets of knowledge.
References
1. Sankar U (2012) Science and Economics for Sustainable
Development of India Working Paper 76/2012; 29p.
Madras School of Economics, Chennai http://www.
mse.ac.in/pub/WORKING%20PAPER%2076.pdf
2. Bryant R & Goodman MK (2013) Environment,
Politics and Development Working Paper Series No
55. 19p. Department of Geography, King’s College,
London.
http://www.kcl.ac.uk/sspp/departments/
geography/research/epd/BryantWP55.pdf
3. James A Baker III Institute of Public Policy (2013) Policy
recommendations for the Obama Administration.
108p. http://www.bakerinstitute.org/publications/BIpub-PolicyRecommendations-021313.pdf
4. Clegg M (2012) Science for Global Development: The
Role of Networks of Science Academies http://www.
fapesp.br/eventos/2012/08/FMC/Michael_Clegg.pdf
Email: r.gopichandran@vigyanprasar.gov.in n
Vigyan Prasar is not responsible for the statements/opinions
expressed and photographs used by the authors in their articles/
write-ups published in “Dream 2047”
Articles, excerpts from articles published in “Dream 2047” may
be freely reproduced with due acknowledgement/credit, provided
periodicals in which they are reproduced are distributed free.
Published and Printed by Dr. Subodh Mahanti on behalf of
Vigyan Prasar, C-24, Qutab Institutional Area, New Delhi 110 016 and Printed at Aravali Printers & Publishers Pvt. Ltd.,
W-30, Okhla Industrial Area, Phase-II, New Delhi-110 020
Phone: 011-26388830-32.
Dream 2047, June 2013, Vol. 15 No. 9
Damodar Dharmanand Kosambi
A Scientist with
Renaissance Versatility
Dr. Subodh Mahanti
E-mail: smahanti@vigyanprasar.gov.in
“Professor D.D. Kosambi was endowed with a truly renaissance versatility. He was one of the few great Indians who grasped the nature
of twentieth century science and technology and its implications for humanity. Shunning the limelight of publicity, he made outstanding
contributions to various fields of knowledge, which included mathematics, statistics, numismatics, Indology, history as well as contemporary
social problems. He devoted a great deal of his time to the Peace Movement and campaign against nuclear weapons.”
Arvind Gupta in Bright Sparks: Inspiring Indian Scientists from the Past, 2009
“The guiding principle in all his (D.D. Kosambi’s) activities was his love for humanism and peace. His approach to life was based on
Marxism but not its blind uncritical application. He used to mix freely with all the cross sections of the community to understand their
problems, as according to him this was the first step to solve problems in science…He was intensely human with natural compassion for
the fellow human being, especially for the underdog and he championed their cause with all vigour and strength.”
P.V. Sukhatme in Biographical Memoirs of Fellows of the Indian National Science Academy (Vol.18), 1994.
“He (D.D. Kosambi) was a larger than life personality, and even his personal life was an important statement. His integrity—personal and
intellectual—was beyond question. Secularism formed the core of his personality. He made no distinction based on religion, caste, race,
or gender, and brought up his children with the same secular ideology. He has always had a unique, international identity as a brilliant,
profound and original scholar straddling many fields of knowledge. And this identity will endure as long as scholarship itself endures.”
Meera Kosambi in Resonance, June 2011.
D
amodar Dharmanand Kosambi made
significant contributions to diverse
fields of human knowledge. He made notable
contribution to the development of higher
mathematics and statistics. He published
research papers in Indian and international
journals in pure and applied mathematics
and statistics. P.V. Sukhatme has described
Kosambi’s fascination with mathematics:
“He (Kosambi) had only a Bachelor’s degree
in mathematics and yet had a complete grasp
over the latest developments in mathematical
research in Europe. He regarded mathematics
as the language of nature, giving preciseness
to the results of other sciences, but was also
aware that nature has its own philosophy.
He was very much fascinated by the clarity
and exactness which mathematics can give
and brought to bear the same in all branches
of science he handled.” In mathematics he
mostly worked in tensor analysis and pathgeometry, a term he himself coined. He also
worked in theoretical and nuclear physics.
Kosambi’s formula for finding
the distance between chromosomes was
considered as a significant contribution
to classical genetics. As pointed out by
Sukhatme, his formula ‘gave satisfactory
additive estimates of map lengths irrespective
Dream 2047, June 2013, Vol. 15 No. 9
Damodar Dharmanand Kosambi
of the kinds of organisms and the lengths of
their chromosomes on which recombination
data are gathered.’
Through his extensive and painstaking
work on Indian coins he established the
science of coins or numismatics as an exact
scientific branch.
He was the first to recognise the
presence of microliths characteristic of
the Stone Age on the Vetal Plateau on the
Western Ghats. He discovered several trade
routes. Based on his extensive field work
he suggested the use of Malshej Ghat, a
mountain pass in the Western Ghats range
in Pune district, as a key road from Mumbai
to Ahmedanagar. It was Kosambi, who first
deciphered the Brahmi inscript at the Karla
Caves, a complex of ancient Indian Buddhist
rock-cut cave shrines located in Karli near
Lonavala in Maharashtra.. He discovered
many Neolithic routes, Buddhist caves,
and old inscriptions. He established the
Archaeology Society and donated his rare
collections to its museum.
Kosambi threw light on the most vital
missing link in the Robert Graves’ researches
on the life of Christ by establishing the
presence of Christ in Kashmir from some rare
documents in Srinagar Fort. He developed
a new interpretation of Indian history. His
classic works on Indian history marked a
new stage in Indian historiography.
Kosambi was a great linguist. He learnt
Sanskrit, Brahmi and Prakrit languages. He
also studied several European languages, viz.,
French, German, Italian, and Russian. He
had enough working knowledge in Latin,
Greek, and Hebrew.
38
History of Science
Kosambi was an active
participant in the activities
undertaken by the World
Peace Council. He led the
Indian delegation to the
World Peace Conference
held at Helsinki in June
1955.
The
Helsinki
Conference was chaired by
the French physicist and
a Nobel Laureate Frederic
Jolliot-Curie and among its
participants were J.D. Bernal
and Jean-Paul Sartre.
Kosambi was born
on 31 July 1907 in village
Kosben in Goa. His father
Dharmanand Kosambi was a
renowned Buddhist scholar.
Dharmanand
Kosambi,
who taught Pali at the
Fergusson College, Pune
was also a Visiting Faculty
of the Harvard University,
USA. Kosambi had his early
schooling in Pune. In 1918,
Kosambi and his sister went
to Cambridge, USA along
with his father, for whom it
was a second visit to Harvard
University. Kosambi first
enrolled in the Cambridge
Grammar School and later
studied at the Cambridge
Latin School. After four
years his father and his sister
returned to India but Kosambi
37
had to stay back to complete his who was heading the Department of
schooling. Eventually he came Mathematics. He stayed at AMU for about a
back to India after completing year. In 1933, Kosambi joined the Ferguson
his school education and he College in Pune, where his father once
wanted to continue his education worked. He served the Fergusson College
in India. However, he failed to for 14 years. Meera Kosambi wrote: “In
get admission in any college 1933 he (Kosambi) joined the faculty of the
in India because the school Fergusson College at Pune. Here he became
educational system of USA was known as an exacting professor, not easy
not compatible with the Indian to understand and not popular with those
system. So, after spending a year who expected to be spoon-fed, but highly
he returned to Cambridge, USA admired by the bright and serious students
J.D. Bernal
and joined Harvard University. who were willing to work hard.” He resigned
In 1929, Kosambi graduated from the college because of his differences
from Harvard University with with college authorities. He was not happy
distinction (summa cum laude). with the ‘examination-ridden system and
Kosambi wanted to pursue his uninspiring standards of education.’
doctoral studies at Harvard, but
On being invited by Homi J. Bhabha,
he could not manage financial Kosambi joined the newly established Tata
support because in view of the Institute of Fundamental Research (TIFR),
on-going economic depression Mumbai in 1946. Initially he had a very
it was extremely difficult to get a cordial relationship with Bhabha. However,
scholarship.
because of his aversion to nuclear energy and
In
1929,
Kosambi
came
fierce independent mind his relation with
Jean-Paul Sartre
back to India and
Bhabha worsened. In
joined Banaras Hindu
1962, Kosambi left TIFR
University as Professor of
as his contract was not
Mathematics. At BHU,
renewed.
where he stayed for about
In 1949, he was a
two years, he also taught
visiting professor at the
German language in
University of Chicago in
addition to mathematics.
USA, where he taught
From BHU, he went
path-geometry. He was
to
Aligarh
Muslim
a guest at the Institute
University (AMU), at the
of Advanced Study at
invitation of Andre Weil,
Princeton, where he
Andre Weil
Dharmanand Kosambi
the French mathematician
took part in extensive
discussion with Albert
Einstein on theory of relativity. In 1964,
Kosambi was appointed scientist emeritus
by the Council of Scientific and Industrial
Research (CSIR) and he was affiliated to the
Maharashtra Association for the Cultivation
of Science, Pune.
While studying old Indian coins
Kosambi developed an intellectual urge
to know about the kings who struck the
coins and he realised that this could be
done only with a fairly good knowledge
of Sanskrit literature. He had no formal
training in Sanskrit literature, but he had
some knowledge of it through informal
studies with his father. So he decided to
study Sanskrit literature in a systematic way.
He began with Bhartrihari’s three Shatakas
of epigrams. He found Bhartrihari’s text
defective and he undertook text-criticism.
Ferguson College in Pune
Dream 2047, June 2013, Vol. 15 No. 9
History of Science
methodology for harnessing
He studied about 400
diverse sources. In his famous
manuscripts within a span of
and seminal essay—which
five years. He not only revived
he labels as ‘note’—entitled
the works of over 50 poets
‘Combined Methods in
who went into oblivion but
Indology’, he critiques the
also added to the knowledge
practice of placing sole reliance
of works of other lesserupon linguistic sources.”
known poets. He prepared a
Sukhatme wrote: “He found
critical edition of the poetry
that no reliable sources of
of Bhartrihari (The Satakadata exist and arrived at a
trayam of Bharthrihari with
new definition of history,
the commentary of Ramarsi)
Homi J. Bhabha
adopting it from the theory of
edited in collaboration with
Karl Marx. According to Prof.
Pandit K.V. Krishnamoorthi
Kosambi,
history
should be related to the
Sharma, 1945). After Bhartrihari’s shatakas
development
of
means
of production and
he took up the Sanskrit literary anthology
that
farmers,
villagers,
low-caste nomads,
Subhashita-ratna-kosha (The Subhasitatribal
minorities
were
the
main sources of
ratna-kosa of Vidyakara edited with V.V.
data
for
writing
history
as
distinct from
Gokhale). Vidyakara’s anthology is the oldest
a
series
of
historical
episodes
relating to
example of Sanskrit literature. These works
kings.”
Realising
the
fact
that
written
words
are considered landmarks in text criticism.
would
not
suffice,
he
engaged
himself
in
Sheldon Pollock wrote: “Two traits, as an
studies
in
archaeology
and
ethnography
ensemble, distinguish D.D. Kosambi in his
work on Sanskrit not only from the scholars and made significant contributions in
who were his contemporaries, but also from these fields. For Kosambi history was not a
almost everyone since. The first is his search subject which dealt only with the dead past.
for method in the editing of Sanskrit literary For him history lived on in the present.
He brought in fundamental insights
texts, and the second his search for a theory
in
understanding
the nature of Indian
in reading of these texts. In the former
feudalism
and
this
led several scholars to
case, if judged by the practices of editing
study
the
feudal
structure
of Indian society
Sanskrit literary texts in India at the time,
and
state.
His
major
works
on
Indian history
Kosambi emerges as a remarkable pioneer,
namely,
An
Introduction
to
the
Study
of Indian
his concrete accomplishment hardly in
History
(1956),
Myth
and
Reality:
Studies
in
danger of being superseded anytime soon.
the
formation
of
Indian
culture
(1962),
The
In the latter, he is exceptional in the history
of Indology for his awareness that the Culture and Civilisation of Ancient India in
method of philology is always inseparable Historical Outline (1965) became a must
from a theory of philology, itself produced reading for researchers and students of
by a tradition of writing and reading, and history both in India and abroad. These
from a cultural and political criticism works have been translated into several
specific to that tradition. If Kosambi’s foreign languages.
Kosambi’s writings on history evoked
theory has proven to be flawed, we have
great
admiration
as well as well as severe
only come to know the flaws and sought
criticism.
Thus
Meera Kosambi wrote:
ways to overcome them because he had the
“This
extensive
re/writing
of history (by
courage to enunciate the theory in the first
D.D.
Kosambi)
elicited
the
expected and
place.”
contradictory
responses.
He
was praised
Kosambi was attracted to Indian
by
some
as
a
pioneer
of
genuine
Marxist
history while he was studying Sanskrit
scholarship
of
the
Indian
past
and
demonised
literature. He redefined the nature and scope
of Indian history. Meera Kosambi wrote: by others as a nasty iconoclast using an alien
“Kosambi is credited with having wrought framework inappropriate for the study of
a revolution through his redefinition of Indian cultural heritage.”
Kosambi was the recipient of the first
the nature and scope of history. For one
Ramanujan
Memorial Prize (1934). He also
thing, he dismantled the entrenched notion
won
a
special
Bhabha Prize in 1947. He
of fixed periods—Ancient, Medieval
was
elected
a
Fellow
of the Indian National
and Modern periods of Indian history.
Science
Academy,
New
Delhi.
For another, he designed an integrated
Dream 2047, June 2013, Vol. 15 No. 9
Kosambi died on 29 June 1966 at the
age of 58.
Based on Kosambi’s way of looking at
Indian history, Arvind Narain Das, a wellknown activist and social scientist produced
a 13-episode serial
titled “India Invented”
in the early 1990s. In
2008, the Department
of Post, Government
of India issued a postal
stamp in memory of Kosambi. A Kosambi
Chair has been established at the University
of Pune.
Kosambi worked in diverse
fields—mathematics, statistics, physics,
numismatics, genetics, Sanskrit literature,
history, and archaeology and made
significant contributions. He not only
raised significant new questions but also
offered original answers. We would like to
end this article by quoting Meera Kosambi:
“Kosambi’s astounding intellectual journey
effectively demonstrates the meaninglessness
of disciplinary boundaries and the insistence
on formal training and degrees as the only
marker of knowledge.”
References
1.
Gupta, Arvind, Bright Sparks: Inspiring
Indian Scientists from the Past, New
Delhi: Indian National Science
Academy, 2009.
2.
Kosambi, Meera, “D.D. Kosambi:
The Scholar and the Man”, Resonance,
pp.501-513, June 2001.
3.
Pollock, Sheldon, “Towards a Political
Philosophy: D.D. Kosambi” and
Sanskrit, Economic and Political
Weekly, pp.52-59, July 26, 2008.
4.
Sukhatme,
P.V.,
“Damodar
Dharmanand Kosambi (1907-1966)”
in Biographical Memoirs of Fellows of
the Indian National Science Academy
(Vol.18), New Delhi: Indian National
Science Academy, 1994.
5.
Available sources on the Internet.
(The article is a popular presentation of
important points on the life and work of Damodar
Dharmanand Kosambi available in the existing
literature. The idea is to inspire younger generation
to know more about Kosambi. The author has given
sources consulted for writing this article. However,
the sources on the Internet have not been individually
listed. The author is grateful to all those writings
have contributed to writing this article.)
36
A Chronicle of Cryptography
I
nformation is becoming an increasingly and intercepting secret information. Data
valuable commodity in modern society. encryption and decryption played an
With the revolution in communication important role in the two World Wars. New
systems, the exchange of information has techniques to encrypt information evolved
Rintu Nath
become very efficient, obliterating the with the development of the telegraph,
E-mail: rnath@vigyanprasar.gov.in
limits of geographic location
radio, computer and Internet.
Secret communication achieved by
or time. However, for services The aim is not to Handwritten
cipher
was
like Internet banking, mobile hide the existence replaced by machine cipher. hiding the existence of a message is known
banking, security services, etc.,
In fact, the urge to develop as ‘steganography’, derived from the Greek
of a message, but complex code for encryption words steganos, meaning “covered,” and
the exchange of data through
rather to hide
the existing communication
and decryption led to the graphein, meaning “to write.” Steganography
also includes the practice of writing in
network is not adequate. It
development of the computer.
its content, a
is essential that the exchange
Cryptography is the invisible ink. The method suffers from a
method known practice and study of different fundamental weakness: If the message is
of data for these services
as encryption
is carried out with utmost
techniques and algorithm of discovered, then the contents of the secret
confidentiality and securely
encryption. The word crypto communication are revealed at once.
without unauthorised access or interception. is derived from the Greek kryptos, meaning Interception of the message immediately
Only an established secured mode of “hidden”. Early cryptography was solely compromises all security.
communication technique can ensure the concerned with converting messages into
integrity of the data.
unreadable groups of figures to protect the Caesar cipher
In most of the cases, information message’s content while the message was The first documented evidence of using
travels through interconnected heterogeneous being carried from one place to another. cryptography was by Julius Caesar. Caesar
communication networks, managed by Modern cryptography, however, in addition used to send written instructions to the
different organisations. Hence, providing to encryption, also deals with message war front. Instead of trying to send the
message secretly, he chose an
physical
security
to
a
innovative method by which
communication network may
he could hide the meaning
not be feasible. Interception
of the message. Even if the
of the data from apparently
messenger was captured by his
secured communication channel
enemy, they would not be able
is possible. Hence the aim is
to understand the meaning of
not to hide the existence of a
the message that the messenger
message, but rather to hide its
was carrying. He simply
content, a method known as
replaced each letter in the
encryption. In encryption, a
Encryption of Message
message with the letter that is
message is scrambled according
three places further down the
to a particular protocol and an encryption key, integrity checking and sender/receiver
alphabet. To honour him for inventing this
which is agreed beforehand between the sender identity authentication.
form of encryption, it is known as Caesar
and the intended recipient. Thus the recipient
shift cipher or simply Caesar cipher.
can reverse the scrambling protocol using the The evolution of
In terms of cryptography, the letters
key and make the message comprehensible. secret writing
Without knowing the scrambling protocol Historically rulers have relied on secret used to write the original message are called
and the key, the unauthorised person would communication in order to govern their plain alphabet and the letters substituted in
find it difficult, if not impossible, to re-create provinces and command their armies. At place of plain letters are called cipher alphabet.
the original message from the encrypted text. the same time, they were all aware of the Messages written using plain alphabets are
Hence, in the event of an unauthorised access, consequences of their messages falling into called plain text and when plain alphabets are
replaced by cipher alphabets, it is
the encrypted message will not be understood the wrong hands, revealing
It was the
called cipher text.
by the unauthorised person. The security of precious secrets to rivals.
In Caesar cipher, if cipher
the message is thus essentially dependent on It was the threat of enemy
threat of enemy
alphabets are placed below the
the strength of the encryption algorithm.
interception that motivated
interception that plain alphabets, it becomes
Data encryption is not a modern the development of codes
motivated the
clear that cipher alphabets are
phenomenon. Practice to hide secret and ciphers: techniques for
information can be traced back to the fifth disguising a message so that
development of shifted by three places.
If the original message
century BC. Historically, many kings, only the intended recipient
codes and ciphers is “attack in the morning”, in
queens and generals relied on sending can read it.
35
Dream 2047, June 2013, Vol. 15 No. 9
Mathematics of Planet Earth 2013
Plain alphabet
a
b
c
d
e
f
g
h
i
j
k
l
Cipher alphabet
D
E
F
G H
I
J
K
L M N O
m n
o
p
q
r
s
u
v
w
x
y
z
P
R
S
T
U
V W X
Y
Z
A
B
C
Q
t
Caesar cipher: cipher alphabets are shifted by three places
used mono alphabetic
Caesar cipher, its cipher
While the
substitution cipher technique
text will be “dwwdfn lq wkh
cryptographer develops to encrypt message, they
pruqlqj”. Clearly the cipher
also knew how to decrypt
new methods of
text is not decipherable.
without any knowledge
This
form
of
secret writing, it
of the key. They in fact
generation of cipher text
is the cryptanalyst
invented ‘cryptanalysis’, the
is known as substitution
science of unscrambling a
who struggles to
cipher, where each alphabet
message without knowledge
is replaced by another
find weaknesses in
of the key. While the
predetermined
alphabet.
these methods in
cryptographer develops new
Although Caesar cipher
methods of secret writing,
order to break into
shifts three places, it is clear
it is the cryptanalyst who
that any number of shifts
secret messages.
struggles to find weaknesses
between 1 to 25 is possible is
in
these
methods
in order to break into
possible to generate a cipher text.
secret
messages.
Drawback of this system is that
Arabian cryptanalysts succeeded in
this code can be broken easily. With the
finding
a method for breaking the mono
knowledge of substitution cipher and with
alphabetic
substitution cipher, a cipher
the help of different permutation and
that
had
remained
unbreakable for several
combinations, this can be broken in no
centuries.
time.
One of the methods employed to
Sometime a key is used in the
break
mono alphabetic substitution cipher
substitution cipher. For example, to use
is
to
use
frequency analysis. In English, ‘e’
“DREAM” as a key, it will be used at the
is
the
most
common letter, followed by ‘t’,
beginning of the cipher alphabet. The
then
‘a’,
and
so on as given in the table 1.
remainder of the cipher alphabet are merely
A
cryptanalyst
can do a frequency
the remaining letters of the alphabet, in their
analysis
of
a
cipher
text
and based on the
correct order, starting where the key ends
frequency
of
letters
he/she
can replace
and not repeating the alphabets used once
the
most
probable
letter
from
table. For
in the key.
Table 1
Letter Percentage Letter Percentage
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
8.2
1.5
2.8
4.3
12.7
2.2
2.0
6.1
7.0
0.2
0.8
4.0
2.4
6.7
7.5
1.9
0.1
6.0
6.3
9.1
2.8
1.0
2.4
0.2
2.0
0.1
This table of relative frequencies is based on
passages taken from newspapers and novels,
and the total sample was 100,362 alphabetic
characters. The table was compiled by
H. Beker and F. Piper, and originally
published in Cipher Systems: The Protection
of Communication. [credit: The Code Book
by Simon Singh]
tenth century.
As cryptanalysts started breaking secret
codes using frequency analysis during the
Plain alphabet
a
b
c
d
g
h
i
j
k
l
m
o
p
q
r
s
t
u
v
w
x
y
z
Cipher alphabet
D
R
E
A M N O
P
Q
S
T
U
V W X
Y
Z
B
C
F
G H
I
J
K
L
e
f
n
Caesar cipher with key 'DREAM'
“attack in the morning” will be now
coded as ‘dffdet qv fpm vxbwqwo”.
An enemy studying an intercepted
scrambled message may guess that each
alphabet is replaced by another, however,
without the knowledge of the key, “DREAM”
in this case, it would be very difficult to
reconstruct the original message.
This method of replacing a letter
by another is known as ‘mono alphabetic
substitution cipher’.
Cryptanalysis
Documentary evidences suggest that during
the ninth century, Arabic scholars not only
Dream 2047, June 2013, Vol. 15 No. 9
example, if a cipher text contains maximum
number of ‘k’, it is quite possible that during
the encryption letter ‘e’ was replaced by ‘k’.
Similarly other letters can also be replaced
based on the frequency of their occurrence.
However, it is not possible to
apply frequency analysis for cryptanalysis
unconditionally, because the standard
list of frequencies in Table 1 is only an
average, and it will not correspond exactly
to the frequencies of every text. Moreover,
frequency analysis is only applicable if cipher
text length is sufficiently large. However,
the method proved to be quite useful in
decrypting many secret codes during the
tenth century, ‘poly alphabetic substitution
method’ was invented, where two similar
letters in the plain text may be represented
by two different letters in the cipher text.
Transposition
There is another form of cryptography,
known as transposition. In transposition, the
letters of the message are simply rearranged,
effectively generating an anagram. For
very short messages, such as a single word,
this method is relatively insecure because
there are only a limited number of ways
of rearranging a handful of letters. For
example, three letters can be arranged in
34
Mathematics of Planet Earth 2013
only six different ways, e.g., rat, tar, atr, tra,
rta, art. However, as the number of letters
gradually increases, the number of possible
arrangements rapidly explodes, making
it impossible to get back to the original
message unless the exact scrambling process
is known. In a ‘transposition cipher’, spaces
in between words are omitted. Therefore,
“attack in the morning” can be jumbledup to “intheackattningmor”. There can be
billions of combination that transposition
cipher will offer, and hence it will be very
difficult to get the meaning unless the
method of transposition is known.
Cryptographers wanted to
Using a computer in all directions and reach
develop a stronger cipher,
receivers wherever they are
to encipher a
something that could outwit
located. Therefore messages
message provided
the cryptanalysts.
will inevitably reach the
In the year 1563,
greater flexibility in enemy as well as the intended
Blaise de Vigenère, a French
recipient.
Consequently,
terms of number
diplomat, invented a coherent
reliable encryption became
of combinations
and powerful new cipher,
a necessity. If the enemy was
now known as the Vigenère
going to be able to intercept
in generating a
cipher. The strength of the
every radio message, then
key and the speed
Vigenère cipher lies in its use
cryptographers had to find a
of operation
of not one or two but twentyway of preventing them from
six distinct cipher alphabets
deciphering these messages.
to encrypt a message. The great advantage of
During the First World War,
the Vigenère cipher is that it is invulnerable cryptographers developed several new
to the frequency analysis. The cipher was ciphers, but all were broken. It was Germany
considered unbreakable. However, the
British cryptanalyst Charles Babbage broke
Vigenère cipher in the year 1854.
Rail fence transposition
In order for transposition to be effective,
the rearrangement of letters needs to follow
a straightforward system, one that has been
previously agreed to by sender and receiver
but kept secret from the enemy. For example,
it is possible to send messages using the “rail
fence” transposition, in which the message
is written with alternating letters on separate
upper and lower lines. The sequence of
letters on the lower line is then tagged on
at the end of the sequence on the upper line
to create the final encrypted message. For
example:
A T T A C K
I
A
I
N
The new era of cryptography
Since Babbage had destroyed the security
of the Vigenère cipher, cryptographers were
searching for a new cipher, something that
would re-establish the secret communication.
Meanwhile,
communication
through
telegraph started during late 18th century.
Businessmen and military wanted to utilise
the instancy of the telegraph without
T H E
M O R N
I
N G
⇓
T
T
C
A
K
T
E
N
H
O
M
N
R
N
I
G
⇓
A
T
C
I
T
E
O
N
N
T
A
K
N
H
M
R
I
G
Rail fence transposition
However, this method of encryption their communications being stolen and
is rudimentary and can be broken easily. An deciphered. Furthermore, during the 19th
enemy studying an intercepted scrambled century an even more powerful form of
message may guess that alphabets are telecommunication, radio communication
rearranged. With the help of
was invented. This made the
different permutations and
need for secure encryption
At the outbreak
combinations, this encryption
even more pressing.
of the Second
can also be broken.
The
ease
of
communication and ease of
World War the
The Vigenère cipher
German military’s interception of radio signals
For centuries, the simple
heralded a mixed blessing for
communications
mono-alphabetic substitution
the cryptographers and thus
cipher had been sufficient to
cryptography was brought
were protected by
ensure secrecy. The subsequent an unparalleled level into sharp focus at the
development of frequency
outbreak of the First World
of encryption.
analysis destroyed its security.
War. Radio signals travel
33
Enigma
that suffered most from these security
breaches. Cryptanalyst of the Allied forces
could intercept and decipher almost all the
secret radio communication of the German
forces.
In the years following the war, there
was a concerted effort to find new and
secure encryption systems. Cryptographers
turned to technologies to help guarantee
the security. Rather than relying on penciland-paper based ciphers, they focussed their
attention on the mechanisation of secrecy.
In 1918, the German inventor Arthur
Scherbius and his close friend Richard
Ritter developed a cryptographic machine
called Enigma. Scherbius patented his cipher
machine in 1918. Enigma was contained in
a compact box measuring only 13.5 inches
× 11 inches × 6 inches (34.3 cm × 27.94
Dream 2047, June 2013, Vol. 15 No. 9
Mathematics of Planet Earth 2013
commerce applications as of now. In fact, so-called unbreakable cipher has, sooner
cm × 15.2 cm) and it weighed about 11 kg.
Scherbius’ invention provided the Public Key Cryptosystem, widely used in or later, succumbed to cryptanalysis. The
most secure system of cryptography in the today’s e-commerce applications uses RSA Vigenère cipher was called unbreakable
algorithm to generate keys.
cipher, but Babbage broke it; Enigma was
world, and at the outbreak
It is estimated that
considered invulnerable until its weaknesses
of the Second World War
The
future
were revealed. Does it mean cryptanalysts
the
German
military’s
even billion years is
The exchange of digital on the verge of another breakthrough? Only
communications
were
not sufficient to break information has become an time will tell us.
protected by an unparalleled
In 1984, Charles Bennett, a research
level
of
encryption. RSA algorithm with integral part of our society.
Every
day
millions
of
e-mails
fellow
at IBM’s Thomas J. Watson
Encryption using Enigma
all the computing
are sent and received. At Laboratories in New York, developed
was based on polyalphabetic
power of the world every moment, the economy the idea of quantum cryptography, an
substitution method. Security
put together.
of world is being managed encryption system that is absolutely
of the encrypted message
online where trillions of unbreakable. Quantum cryptography is
was based on the secret key.
To provide added security, everyday there dollars are moving around. Critically, the based on quantum physics, a theory that
used to be a new key, called ‘day key’. Due success of all electronic transactions depend explains how the universe operates at the
to frequent change in the encryption key, on the ability to protect information as most fundamental level. Bennett’s idea is
they flow around the world, and this is based on an aspect of quantum physics
cipher text generated by
only possible through the known as Heisenberg’s uncertainty principle,
Enigma was almost impossible
Quantum
power of cryptography. which states that it is impossible to measure
to break with conventional
methods. However, in 1932 cryptography is based Encryption can be seen as something with perfect accuracy because the
Polish mathematician and on quantum physics, providing the locks and keys act of measurement alters the object being
of the Information Age. For measured. However, quantum cryptography
cryptologist Marian Rejewski
a theory that explains many years requirement of is still in its early stage and further research
could devise a method to
how the universe
encryption was limited to is going on to implement the idea in daily
break the codes generated by
Enigma machine.
operates at the most government agencies and transactions.
military. However, now every
During World War
fundamental level. common man is directly Sources
II, Alan Turing, a British
mathematician, devised a number of or indirectly dependent on this important Simon Singh, The code book : how to make
it, break it, hack it, crack it, Delacorte
techniques for breaking German ciphers, branch of science.
The invention of public key
Press, New York
including the method of the bombe, an
electromechanical machine that could find cryptography using RSA algorithm provides David Kahn, The Codebreakers: The Story
of Secret Writing, Macmillan
settings for the Enigma machine. In fact, unparalleled security. It is estimated that
Turing’s research in the field of cryptography even billion years is not sufficient to break An excellent account on history and
chronology of cryptography may be
finally gifted the world the ‘Turing machine’, RSA algorithm with all the computing
found at: http://en.wikipedia.org/
which can be considered a model of a general power of the world put together. Previous
experience, however, tells us that every
wiki/Cryptography
purpose computer.
Finally, In 1945, ENIAC (Electronic
Numerical Integrator and Calculator),
world’s first computer, was developed.
ENIAC was capable of performing five
thousand calculations per second.
Presents New Video Serials
Using a computer to encipher a
message provided greater flexibility in terms
of number of combinations in generating a
key and the speed of operation. As a computer
uses binary number system, interception of
any message will only provide streams of ‘0’
‘Every Thrusday on Lok Sabha TV at 10.30-11.00 AM
and ‘1’, thus making it extremely difficult to
From 01 June, 2013'
break the code.
In 1977, while working in the MIT
The 13 part serial is based on current trends in chemistry aimed at popularly
Laboratory for Computer Science, Ronald
presenting chemistry in our daily life. Application of chemistry in various pioneer
Rivest, Adi Shamir and Leonard Adleman
areas like nanotechnology, biochemistry, health, construction, soil and agriculture
created the RSA algorithm using the concept
and Green chemistry etc. are covered.
of prime factors. RSA stands for the initials
At the end of each episode a quiz for viewer’s with attractive prizes awaits.
of the inventors’ surnames. RSA algorithm
is one of the most robust algorithms in e-
Vigyan Prasar
‘Jo Hai Jaisa… kyon hai Vesa?’
(Story of Chemistry)
Dream 2047, June 2013, Vol. 15 No. 9
32
Follow your own curiosity
Interview with Anthony James Legget
S
ir Anthony James Legget, popularly
known as Tony Legget in the scientific
community, is a leading scientist in the
field of low-temperature physics. He has
widely contributed to understanding the
normal and super-fluid liquid helium and
strongly-coupled superfluids. He has also
deep interest and insight in testing the
foundations of quantum mechanics using
condensed systems. His pioneering work in
the field of superfluidity was recognised by
the award of the Nobel Prize in Physics in
2003. He is an honorary fellow of Institute
of Physics (UK). He was knighted in 2004
“for services in physics”. He is also a Fellow
of the Royal Society.
Legget was born on 26 March 1938 in
a small town Camberwell, south of London
in England. Legget won a scholarship from
Oxford University in 1954 to study classics.
After completing the degree, in the early
summer of 1958, he applied to do a second
Oxford undergraduate degree, in physics.
After completing his academics, he did his
Ph.D. on “Some Problems in the Theory
of Many-Body Systems”, with Prof. Dirk
ter Haar at Magdalen College, Oxford. His
theoretical understanding of physics took
shape here and blossomed. After completing
his post-doctoral studies, he accepted an offer
from the University of Illinois at UrbanaChampaign (UIUC) of the MacArthur
Chair, in the spring of 1982.
Meher Wan had an opportunity to
listen to Sir Anthony, who delivered an
invited lecture in Physics Department,
University of Allahabad some years back.
Here are the excerpts of an interview with
Sir Anthony that Wan conducted through
e-mail.
Meher Wan: Let me thank you on
behalf of our readers for accepting my request
for an interview on your research, life and
philosophy. Your pioneering research work on
super-fluidity was considered for the Nobel
Prize in Physics in 2003. How has your life
changed after becoming a Nobel laureate?
What kind of relief or responsibility do you
feel after winning this prestigious prize?
Prof. A.J. Legget: There are
many ways in which my life has changed. I
get more invitations than previously to give
popular talks, etc., and more people want
31
me to write letters of recommendation for
them. Most interestingly, I am continually
being pressed to express in public opinions
on matters of which I do not know enough
to have an informed opinion.
M.W.: Let us peep in to your
childhood. How do you remember your
Sir Anthony James Legget
school days and Beaumont? Were you
extraordinarily brilliant in your school,
or you achieved these successes by merely
chasing your curiosity and intent for the
quest of nature?
A.J.L.: Well, I remember that they
used to give prizes for the best performance
in about eight different academic subjects,
and one year I got the prizes in all eight,
which I believe was unprecedented. So
I suppose that I did have a reputation for
outstanding academic ability.
M.W.: At your times in schools, one
had to choose science or classics or arts as
stream of study in his/her very early stage
of studies. When you came to Allahabad,
India in a Science Conclave, you revealed
that primarily you have chosen classics and
literature as your study majors. What were
the reasons for choosing classics and not
science, when your father was a science
teacher?
A.J.L.: Actually, I think my father
was steeped in the attitude which was
common in Britain at that time (the early
fifties, pre-Sputnik), namely that classics was
the most “prestigious” subject and science
right at the bottom of the pecking order.
Certainly he was quite happy to see me go
into classics.
M.W.: After spending five years
studying classics, what was the motivating
force for opting for science and especially
physics?
A.J.L.: Actually it was a good deal
more than five years (about 5 at high school,
then 4 at Oxford, if you count the part
spent on ancient history and philosophy).
The reason for my shift was, first, I was too
unimaginative to think about any career
other than an academic one, and secondly, I
became convinced that, rather than working
in a subject such as philosophy, where there
seems to be no clear objective criteria of what
constituted good work or bad, I wanted to
work in a discipline where Nature herself
could prove me right or wrong.
M.W.: How did the study of classics
help in your further career? Did you imagine
at that time, that you will do so well in
physics after spending so much time in other
subjects?
A.J.L.: I realised that my comparative
age was some disadvantage, but I felt that
my experience of studying philosophy, in
particular, might compensate for this. And
indeed I have found it extremely helpful, in
particular in that I suspect I am much more
skeptical than many of my colleagues about
the “established” wisdom and the reasoning
behind it.
M.W.: At the time of your postdoctoral work in University of Illinois,
John Bardeen and some other impressive
experimental physicists were working there.
How did they influence you in the process of
being a better researcher?
A.J.L.: Like many others, I did not
find John the easiest person in the world to
talk to, but he and Leo Kadanoff played a
crucial role in my career by suggesting the
problem which led indirectly to my work on
superfluid Helium-3. I got more out of my
interactions with David Pines (my formal
postdoctoral adviser), Leo and Gordon
Baym, as well as with the many bright
postdocs who were at Illinois at that time.
M.W.: You have travelled around
the globe. What is the status of education
Continued on page 21
Dream 2047, June 2013, Vol. 15 No. 9
Water Footprint and Virtual Water –
Emerging Concepts in Water Management
D
uring the last few decades water has
become the most talked about subject
and has been termed as the most precious
as well as abused natural resource. As days
pass water is becoming the cause of conflict
everywhere. It is probable that today’s food
production and environmental trends, if
contained, will lead to crises in many parts
of the world. Only if we act to improve
water use in every sector we may be able to
meet the acute freshwater challenge over the
coming 50 years.
When rain drops on earth it is divided
into two components, the blue water and
the green water. The global ratio of blue
vs green water is 35:65. But it varies from
country to country. In Ghana, for example,
the ratio of blue vs. green water is 2.5:97.5
whereas in India the ratio is 35:65. It is
Blue water and green water
In recent years, several issues of global
changes have given rise to a number of
concepts of sustainable use and management
of water. Water footprint is a new concept
in the field of water management. Generally,
consumption of water is measured in
terms of water harvested from natural
sources and consumed and utilised in
various ways. We generally consider the
consumption or utilisation of water that is
visible and practically measurable. In those
terms an urban individual generally utilise
about 150 litres of water per day. A rural
family consumes much less water. This use
encompasses all uses, including drinking,
bathing, washing, gardening, etc. We do
not take into account of the water that is
consumed during the production of any
goods or the production of crops in the fields.
Terrestrial crops generally do not consume
water from the visible sources of water like
rivers lakes or groundwater unless the fields
are irrigated. They solely depend on soil
water, which is not accessible by the animals
or humankind as such. So under the new
concept of water footprint, water is termed
‘blue water’ and ‘green water’ depending
on the source. Blue water is available in all
visible sources of water like rivers, lakes,
ponds and groundwater. But the water that
resides in the pore spaces in the soil is called
green water. Regarding human consumption
of water, we generally consider three major
areas − domestic, agricultural and industrial.
But these uses are all visible uses that we can
directly measure. The consumptive uses of
water and its loss from soil to the atmosphere
through the process of evapo-transpiration
seldom come to our mind.
Dream 2047, June 2013, Vol. 15 No. 9
generally assumed that blue water is the
runoff water and will flow into the sea or
accumulate in water bodies or aquifers. We
lift water from these sources, consume a part
of it, add to green water through irrigation
and also contaminate a part of it. The water
we contaminate by the process of washing,
cleaning, etc., is called grey water.
Virtual water
The water consumed by the plants is not
measurable directly. But It has been possible
experimentally to estimate the amount of
water consumed by each type of plant or
the amount of water required to grow unit
mass of plant biomass or crop. Because the
process of photosynthesis requires so much
water to be transpired in order for CO2 to
be taken in, agriculture accounts for much
more virtual water than the industrial
processes. The consumptive relation between
carbon intake and release of water vapour
through the stomata of a plant is extremely
asymmetrical. It depends on the how many
moles of H2O are required to fix one mole of
Pradip K Sengupta
E-mail: sengupta_pradip@yahoo.com
CO2 of a particular plant. As a result most
cultivated plants need 900–1,200 moles,
and some up to 4,000 moles, of H2O to fix
1 mole of CO2.
Thus another concept is developed
which is called virtual water. The concept of
virtual water had initially been introduced
by John Anthony Allan of the School
of Oriental and African Studies of the
University of London in the early 1990s
while studying the water scarcity problems
in West Asia. Virtual water is the amount
of water required to grow a product. The
product may be an agricultural product or
an industrial one. Agricultural products like
rice, wheat, vegetables require a huge amount
of water to grow. For example, virtual water
content of rice, wheat and potato are 2,850,
1,400 and 1,000 litres/kg respectively.
Non-vegetable food stuff require a
higher quantity of water for its production.
A recent study has revealed that in North
America the most efficient broiler feed system
consumes 2.2 units of feed to produce one
unit of broiler mass, out of which only 55%
is edible. Hence 4 kg of feed is required to
produce 1 kg of edible meat. This amount
is much higher in other meats like beef
and pork. 1 kg of boneless pork requires
10 kg of feed (corn equivalent). The feed
is a combination of soybean (for protein)
and corn (for carbohydrate). The water
requirement for producing 1 kg of corn
and soybean is 500 litres and 1,900 litres
respectively. Hence the virtual water content
of 1 kg boneless pork comes to be at least
15,000 litres!
The concept of virtual water should
not be confused with the actual water
content of the biomass or food grain. Food
grains are harvested when the moisture
content of the crop is at its minimum, viz.,
20 to 25%. This moisture content is further
made to drop below 14% by drying when it
is marketed. So 1 kg of wheat contains only
110 g of actual water when it is marketed.
We may also take virtual water content
of products into consideration. The reader
30
Environment
are enough possibilities of a water-intensive
country to earn foreign exchange and profit
from their water abundance.
Within India there is virtual water
flow from state to state. Even the waterscarce states like Punjab and Haryana export
virtual water to water-rich states in the east.
The eastern states are saving water through
import of wheat and rice from other states.
Water footprint
may now be interested in knowing the virtual
water contents of the different products
or uses in each case or event. It has been
calculated that one cup of coffee requires
140 litres of water taking into consideration
all aspects of cultivation, processing, and
its preparation for the table. Similarly the
virtual water content of a T-shirt is 2,000
litres. In this way every product or usage can
be expressed in terms of virtual water.
Virtual water trade
Some countries of the world are considered
as water-scarce because they do not have
adequate water to meet their current and
projected water needs, while some other
countries are water-rich. Water-rich countries
have more water compared to their demands.
Further, in big countries there are regions of
surplus or deficient water availability. If one
country exports a water-intensive product to
another country, it exports water in virtual
form. In this way some countries support
other countries in their water needs. Trade
of real water between water-rich and waterpoor regions is generally impossible due to
the large distances and associated costs, but
trade in water-intensive products (virtual
water trade) is realistic. It is not wise to
produce water intensive products in a water
scarce country. They can import it from
other countries and keep their domestic
water resource for other uses like sanitation,
environment and navigation. Moreover there
29
By definition, water footprint is the
consumption based assessment of water
utilised by an individual, community,
product, industry, state, or a country. Any
geographical entity can have its own water
footprint. Water footprint of an individual
or a community is estimated by multiplying
all goods and services consumed by their
respective virtual-water content.
Finally, water footprint is an indicator
of human appreciation of natural capital. Its
common denominator is use of freshwater
resources.
Calculating a Water
Footprint (WF)
For calculating water footprint of an
individual, each commodity used by the
individual and the virtual water content of
those commodities are taken into account
and is added to the real blue water used by
the individual. The WF of the community
is achieved through the accumulation of the
data of individuals. If we try to calculate
the WF of a household we should take
into account the green water footprint by
calculating the food consumed and other
commodities used in the family and its
virtual water content plus the visible water
used for drinking, cooking, washing, toilet,
gardening, etc. The waste water produced
from the household will come into the
account of gray water footprint. The unit
of water footprint of an individual is cubic
metre per capita per year (m3/cap/year). One
can calculate his/ her own water footprint
at this website: http://www.waterfootprint.
org/?page=cal/WaterFootprintCalculator
Table: Water footprint of some selected nations
Sl No
Country
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Australia
Bangladesh
Brazil
Canada
China
Egypt
France
Germany
India
Indonesia
Italy
Japan
Jordan
Mexico
Netherlands
Pakistan
Russia
South Africa
Thailand
United Kingdom
USA
Global ( Total/ average)
National (Gm3/year)
26.56
116.49
233.59
62.8
883
69.5
110.19
126.95
987.38
269.96
134.59
146.09
6.27
140.16
19.4
166.22
270.98
39.47
134.46
73.07
636.01
7,452
Per capita (m3/
cap/year)
1,393
896
1,381
2,049
702
1,097
1,875
1,545
980
1,317
2,332
1,153
1,303
1,441
1,223
1,218
1,858
931
2,223
1,245
2,483
1,243
Source: Chapagain, A.K., Hoekstra, A.Y. ‘Water footprints of nations, Volume 1, 2:
Appendices’, Value of Water Research Series No. 16, UNESCO-IHE
Dream 2047, June 2013, Vol. 15 No. 9
Environment
Calculating a nation’s
water footprint
Generally, a country does not entirely depend
on its own virtual water resources nor is
all of its virtual water production entirely
consumed within the country. Therefore a
nation’s water footprint has two components,
the internal and the external water footprint.
The internal water footprint of a nation is
the sum total of the agriculture water use,
domestic water use, and industrial water use
minus the virtual water export in the form of
products produced in the country.
The products imported to a country
accounts for the external water footprint
(EWFP) of the country. It is defined as
the annual volume of water resources used
in other countries to produce goods and
services consumed by the inhabitants of the
country concerned. It is also equal to the
virtual water import into the country minus
the volume of virtual water exported to other
countries as a result of re-export of imported
products.
Virtual Water Import (VWI) − Virtual
Water Export (VWE) = External Water
Footprint (EWFP)
So, the total water footprint of a
country = internal water footprint + external
water footprint.
[The unit of water footprint of a nation
is Giga cubic metre per year (Gm3/yr)]
Water footprint varies from country to
country. In a country where the individual
(per capita) water footprint is low, the national
WF may be very large if the population of the
country is large. The global water footprint
is 7,450 Gm3/yr, which is 1,240 m3/cap/yr
on average. The national and average per
capita water footprints of some nations are
shown in the table below.
Conclusion
The concept of water footprint and virtual
water is new. Virtual water deals with the water
required for production of a commodity or
a service. It is the product-based estimation
of water consumption. Water footprint is
the consumption-based estimation of water
use of an individual, community or country.
Virtual water of the same product may vary
from one country to other depending on
both climate and technology.
Water footprint depends on the
lifestyle, food and consumption pattern. By
exporting and importing virtual water in the
form of products a country can reduce or
Dream 2047, June 2013, Vol. 15 No. 9
increase its water footprint. Water footprint
of a locality may change if the land use
pattern is changed. If an agricultural land
is converted into an industrial land or an
urban agglomeration the water footprint
will change to a great extent. We can
appropriately judge whether the land use
change would have any adverse effect or not
if we calculate the present and future water
footprint.
There are several ways postulated
by experts to reduce water footprint of a
nation. The first is by adopting production
techniques that require less water per unit of
product. Water productivity in agriculture
can be improved for instance by applying
advanced techniques of rainwater harvesting
and supplementary irrigation.
A second way of reducing water
footprints is to shift to consumptions
patterns that require less water; for instance,
by reducing meat consumption as well as fuel
consumption. Water footprint can be reduced
if bicycles are used for short-distance travel
instead of a car. It has also been observed
that meat consumption has an increasing
trend worldwide. Consumption pattern
may be revised or regulated by appropriately
pricing and building awareness.
A third method that can be used is
to shift production from areas with low
water-productivity to areas with high waterproductivity, thus increasing global water
use efficiency. For instance, Jordan has
successfully externalised its water footprint
by importing wheat and rice products from
the USA, which has higher water productivity
than Jordan.
Water footprint study in India is now
at an initial state. Most of the studies in
India or on India have been done in mega
level covering the whole nation or certain
states. Estimates of local area water footprint
or virtual water flow from crop land to the
consumers have not yet been used for local
level planning or development. One or two
beverage companies and petrochemical
companies are starting to introduce virtual
water assessment of their products. In any
state of India assessment of water footprint of
any land area (watershed, village, forest land,
etc.) can be a potential decision support tool
before converting a land from agriculture or
forest to industries. Such assessment may
lead to a prospective planning and also work
as an aid to reduce conflicts on water.
References:
1. Vijay Kumar and Sharad K. Jain (2007). Status
of virtual water trade from India, Current
Science, Vol. 93, No. 8, 25
2. Hoekstra, A.Y. (ed.) (2003). Virtual water
trade: Proceedings of the international expert
meeting on virtual water trade, Value of Water
Research Series No. 12, UNESCO-IHE
3. Chapagain, A.K., Hoekstra, A.Y. (2004).
‘Water footprints of nations, Volume 1: Main
Report’, Value of Water Research Series No.
16, UNESCO-IHE
4. Chapagain, A.K., Hoekstra, A.Y. (2004).
‘Water footprints of nations, Volume 2:
Appendices’, Value of Water Research Series
No. 16, UNESCO-IHE
5. Chapagain, A.K., Hoekstra, A.Y., Savenije,
H.H.G., Gautam, R., 2006b. The water
footprint of cotton consumption: An
assessment of the impact of worldwide
consumption of cotton products on the water
resources in the cotton producing countries.
Ecological Economics 60 (1), 186–203.
6. Hoekstra, A.Y., Chapagain, A.K., 2007a.
Water footprints of nations: water use by
people as a function of their consumption
pattern. Water Resources Management 21 (1),
35–48.
7. Vaclav Smil, (2008), Water News: Bad, Good
and Virtual, Rational thinking about water
may be key to ensuring a clean, plentiful
supply, American Scientist, Volume 96, Sigma
Xi, The Scientific Research Society.
VP website
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read online publications. You may
also join the discussion forum to
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28
Benign Prostate Enlargement
Weighing the Treatment Options
It was one of the deadliest and heaviest feelings of my life to feel that I was no longer a boy. From that
moment I began to grow old in my own esteem–and in my esteem age is not estimable.
—Lord Byron, Byron’s Letters and Journals,Vol. 9
L
ike grey hair and bald pates, prostate gland enlargement is a
common ageing change which occurs in men as they grow older.
Doctors often refer to it as benign prostatic hyperplasia (BPH) or
benign prostatic hypertrophy, and that’s simply their way of saying
it’s not cancer. However, if you are careless about it and leave it
untended, anenlarged prostate can block the flow of urine and
produce bothersome bladder and kidney problems.
Several treatments
work wellfor prostate
gland enlargement. In
deciding what makes the
best option, your doctor
will
consider
your
individual symptoms, the
size of your prostate, the
other health problems
you may have, and your
own preferences. Currently, thefirst lineof treatment revolves around
lifestyle changes andmedications. Some men may, however, need
surgery. These are those few, who do not do well with medication.
The treatment drill begins with tests and diagnosis, which
aimat establishing a definitive diagnosis and quantifying the extent
of problem.
Tests and Diagnosis
You are likely to first notice the symptoms of prostate gland
enlargement yourself, and seek a doctor’s help. When prostate
enlargement is suspected, it is best to see a surgeon, or preferably,
an urologist, a doctor who specialisesin problems of the urinary
tract and the male reproductive system. Several tests help the doctor
identify the problem. The tests vary from patient to patient, but the
following are the most common.
Detailed questions about your symptoms
Your doctor will want to know all about yoursymptoms, what
medications you’re taking and if you have had an ultrasound
examination in the recent. He may also
ask you to complete a questionnaire such
as the American Urological Association
(AUA) Symptom Index for benign prostatic
hyperplasia.
Digital rectal examination
This examination is usually the first test
done. The doctor inserts a gloved finger into
the rectum and feels the part of the prostate
next to the rectum. This examination gives
the doctor a general idea of the size and
condition of the gland.
27
Dr Yatish Agarwal
e-mail: dryatish@yahoo.com
Prostate-Specific Antigen (PSA) Blood Test
To rule out prostate cancer, your doctor may recommend a PSA
blood test. PSA, a protein produced by prostate cells, is frequently
present at elevated levels in the blood of men who have prostate
cancer.
A PSA test when used in conjunction with a digital rectal
examination can help detect prostate cancer in men who are age 50 or
older and for monitoring men with prostate cancer after treatment.
However, much remains unknown about the interpretation of PSA
levels, the test’s ability to discriminate cancer from benign prostate
conditions, and the best course of action following a finding of
elevated PSA.PSA levels can also be elevated due to recent rectal
digital examination, rectal ultrasound tests, surgery or infection
(prostatitis).
Trans-Rectal Ultrasound
An ultrasound test provides measurements of your prostate and also
reveals the particular anatomy of your prostate. With this procedure,
an ultrasound probe about the size and shape of a large cigar is
inserted into your rectum. Ultrasound waves bouncing off your
prostate create an image of your prostate gland.
Post-void residual volume test
This test measures whether you can empty your bladder completely.
This is often done by using an ultrasound test to measure urine left
in your bladder immediately after you have voided the bladder.
Prostate biopsy
If there is the slightest suspicion of prostate cancer, your doctor may
recommend a biopsy test with guidance under rectal ultrasound. In
this procedure, a probe inserted in the rectum directs sound waves
at the prostate. The echo patterns of the sound waves form an image
of the prostate gland on a display screen. To determine whether
an abnormal-looking area is indeed a tumour, the doctor can use
the probe and the ultrasound images to guide a biopsy needle to
the suspected tumour. The needle collects a few pieces of prostate
tissue for pathological examination with a
microscope.
Urinary flow test
This test measures the strength and amount
of the urine flow. You are asked to urinate into
a receptacle attached to a special machinethat
measures how quickly the urine is flowing.
A reduced flow often suggests prostatic
enlargement.The results of this test over time
help determine if your condition is getting
better or worse.
Dream 2047, June 2013, Vol. 15 No. 9
Mediscape
Cystoscopy
In this examination, the doctor inserts a small tube through the
opening of the urethra in the penis. This procedure is done after a
solution numbs the inside of the penis so all sensation is lost. The
tube, a lighted flexible telescope called a cystoscope, contains a lens
and a light system that help the doctor see the inside of the urethra
and the bladder. This test allows the doctor to determine the size of
the gland and identify the location and degree of the obstruction.
What you can do to ease the symptoms
Making some lifestyle changes can often help control the symptoms
of an enlarged prostate and prevent your condition from worsening.
Try these measures:
Limit beverages in the evening
Don’t drink anything for an hour or two before bedtime to help you
avoid wake-up trips to the bathroom at night.
Don’t drink too much caffeine or alcohol
These can increase urine production, irritate your bladder and
worsen your symptoms.
researchers have questioned the need for early treatment when the
gland is just mildly enlarged. The results of their studies indicate that
early treatment may not be needed because the symptoms of prostatic
enlargement clear up without treatment in as many as one-third of
all mild cases. Instead of immediate treatment, they suggest regular
checkups to watch for early problems. If the condition begins to pose
a danger to the patient’s health or causes a major inconvenience to
him, treatment is usually recommended.
Since prostatic enlargement can cause urinary tract infections,
a doctor will usually clear up any infection with antibiotics before
treating the prostatic enlargement itself. Although the need for
treatment is not usually urgent, doctors generally advise going ahead
with treatment once the problems become bothersome or present a
health risk.
Medications
Medications are the most common treatment for moderate symptoms
of prostate enlargement. Medications used to relieve symptoms of
enlarged prostate include:
Alpha blockers
Anti-histamines are generally prescribed for allergies, common cold,
cough, itching and a number of skin conditions. These medicines
tighten the band of muscles around the urethra that control urine
flow, which makes it harder to urinate.
These
medications
relax
bladder neck muscles and
muscle fibres in the prostate
itself and make it easier to
urinate. These medications
include terazosin, doxazosin,
tamsulosin, alfuzosin and
silodosin. Alpha blockers work
quickly. Within a day or two,
you’ll probably have increased
urinary flow and need to urinate less often. These may cause a
harmless condition called retrograde ejaculation — semen going
back into the bladder rather than out the tip of the penis.
Go when you feel the urge
5 alpha reductase inhibitors
If you take diuretics, talk to your doctor
Diuretics are medicines often prescribed to people with high blood
pressure, heart failure, and liver conditions. If you’re taking them,
maybe a lower dose, taking them only in the morning, or a milder
diuretic or change in the time you take your medication will help
ease urinary symptoms. However, don’t stop taking diuretics without
first talking to your doctor.
Limit decongestants or antihistamines
Try to urinate when you first feel the urge. Waiting too long to
urinate may overstretch the bladder muscle and cause damage.
Schedule bathroom visits
Try to urinate at regular times to “retrain” the bladder. This can be
done every four to six hours during the day and can be especially
useful if you have severe frequency and urgency.
Stay active
Inactivity causes you to retain urine. Even a small amount of exercise
can help reduce urinary problems caused by an enlarged prostate.
Try this trick
Urinate — and then urinate again a few moments later. This is
known as double voiding. This will help you empty your bladder
well and keep the post-void residual urine volume down.
Keep warm
Colder temperatures can cause urine retention and increase your
urgency to urinate.
Weighing your treatment options
Men who have prostatic enlargement with symptoms usually
need some kind of treatment at some time. However, a number of
Dream 2047, June 2013, Vol. 15 No. 9
These medications shrink your prostate by preventing hormonal
changes that cause prostate growth. They include finasteride and
dutasteride. They generally work best for veryenlarged prostates. It
may be several weeks or even months before you notice improvement.
While you’re taking them, these medications may cause sexual side
effects including impotence (erectile dysfunction), decreased sexual
desire or retrograde ejaculation.
Combination drug therapy
Taking an alpha blocker and a 5 alpha reductase inhibitor at the same
time is generally more effective than taking just one or the other by
itself.
The Medical Therapy of Prostatic Symptoms (MTOPS) Trial,
supported by the United States National Institute of Diabetes and
Digestive and Kidney Diseases (NIDDK), recently found that using
finasteride and doxazosin together is more effective than using either
drug alone to relieve symptoms and prevent BPH progression. The
two-drug regimen reduced the risk of BPH progression by 67 percent,
compared with 39 percent for doxazosin alone and 34 percent for
finasteride alone.
(Next month: Surgical treatments
for prostate enlargement)
26
Recent developments
in science and technology
Hints of dark matter found
dollars have been spent building experiments
to track it down. One possible candidate for
dark matter are theoretical particles known
as ‘weakly interacting massive particles’, or
WIMPs, which are being searched for by
an experiment called the Cryogenic Dark
Matter Search, or
CDMS experiment in
an underground lab
in USA. If WIMPs
exist, one should very
occasionally
slam
into the nucleus of a
silicon or germanium
atom,
causing
a
release of energy and
a detectable vibration
in the crystal. The
CDMS experiment is
designed to pick up
the signal of WIMPs as
The Cryogenic Dark Matter Search experiment, or CDMS, adds new Earth passes through
the Milky Way galaxy’s
intrigue to the subatomic hunt. (Credit: Reidar Hahn/Fermilab)
sea of dark matter. The
CDMS consists of a
rotation. Then, in 1933, Swiss astronomer
network of silicon and germanium crystals
Fritz Zwicky proposed that perhaps the
cooled to near absolute zero. It is located
mass was there, but was non-luminous (not
in the Soudan Underground Laboratory
visible to the naked eye). Subsequent studies
in Minnesota, a former iron mine more
on everything from rotation of galaxies,
than 700 metres beneath the surface. The
gravitational lensing, star cluster movements
hundreds of metres of rocks and earth above
and measurements of the cosmic microwave
the experiment prevent other particles, such
background all indicate the presence of more
as protons and neutrons, from reaching the
mass than what we can directly measure
crystals and triggering a false positive.
through observing in the electromagnetic
Scientists working with the CDMS
wavelengths. This unseen matter that is
experiment reported on 13 April 2013 that
not visible but has mass was called ‘dark
they have detected three potential signatures
matter’. Scientists now estimate that the
of exotic dark matter particles hidden in the
observable Universe that we can explore
readings recorded with silicon detectors. The
with visible and invisible electromagnetic
findings were presented at the American
radiation emitted by the stars, galaxies and
Physical Society meeting in Denver, USA.
interstellar gases constitutes only 4 per cent
The interactions seen by the CDMS team
of the entire Universe – the rest is made up
point to the existence of WIMPs with a
of two other constituents called dark matter
best-guess mass of 8.6 billion electron volts,
and dark energy. Exactly what dark matter
which would be about nine times as massive
is, and how it came to be is still a mystery.
as the proton. The scientists say there is
But, physicists have identified the three most
a 99.8 per cent chance that their results
likely types of dark matter and the candidate
reflect a real phenomenon rather than an
particles associated with each type.
experimental error. Although significant, it is
Physicists have puzzled over the nature
not significant enough to claim a discovery.
of dark matter since the 1930s, and billions of
To make such a claim, the confidence level
In the early part of the 20th century, physicists
were having a difficult time explaining the
rotation curves of other galaxies. In other
words, galaxies did not appear to have
enough mass to explain their observed
25
Biman Basu
E-mail: bimanbasu@gmail.com
would have to go up to 99.9999 per cent,
or 5-sigma. So the researchers do not claim
to have discovered dark matter particles,
but their finding qualifies as a rare clue in
the quest to understand the Universe’s most
elusive substance.
According to Rupak Mahapatra, a
physicist at Texas A&M University who is a
principal investigator, “People shouldn’t come
away from this thinking that we’ve found
dark matter. Really, it’s just the beginning.
... What we really need to do is make more
detectors and run them, and be sure.” If the
results are confirmed by further experiments
that would point to the existence of WIMPs
that could help account for the 27 per cent
of the Universe that is thought to consist of
dark matter.
According to Mahapatra, it took almost
five years to notice the potential dark matter
events because the CDMS team began their
analysis by looking at the results from a set
of germanium detectors, which are sensitive
to higher masses. Another set of data was
collected using silicon detectors, which are
sensitive to lower masses, but those readings
were initially put aside. Re-examination of
the silicon detector data eventually led to the
discovery of the significant results.
Babies have consciousness
like grown-ups
How early do babies become conscious
about what they see and observe? Till
recently it was not known because scientists
were not able to clearly show that infants
react with awareness rather than reflexively.
For example, an infant may turn its head
towards a colourful object, but does it really
do it consciously? When a baby looks toward
a face or grasp an object, they, too, might
be doing so without a conscious experience
of what they are seeing. Now we have the
answer. New research has shown that infants
have a conscious experience of the world at
as early as 5 months of age.
According to scientists, even in adults,
much of the brain’s processing of the world
Dream 2047, June 2013, Vol. 15 No. 9
New Horizons
compared to adults,
the infants took
longer to register
what they observed.
For example, in 5month-olds, it took
1.3 seconds for
the second flurry
of brain activity to
show up. In adults,
the timing is closer
to three-tenths of
a second, or 0.3
seconds. That is, it
is about four times
Infants, including this 5-month-old boy fitted with an electrode-covered slower in younger
cap and held by his mother, display electrical brain responses possibly infants compared to
representing visual awareness, a new study finds. (Credit: S. Kouider) adults. The researchers
found that older
around occurs without conscious awareness. babies showed faster processing, though still
Experiments have shown that when adults not as quick as adults. In 12- to 15-monthare shown an image for an extremely short olds, the second phase is stronger than in 5time, their brains show a spike in electrical month-olds and occurs around eight-tenths
activity in sensory regions - even though to nine-tenths of a second.
The researchers now plan to use even
they may not consciously register that they
have seen such a brief image. However, more inviting stimuli, such as toys babies
when the image does consciously register, like, to test whether familiar objects garner
the brain shows a second leap in activity, a quicker brain response. They also plan to
typically about 300 milliseconds after the test babies as young as 2 months old for
presentation of the image. This pattern consciousness.
reveals visual consciousness. Neuroscientist
Sid Kouider, of the Laboratoire de Sciences A hormone to treat diabetes
Cognitives et Psycholinguistique in Paris and Diabetes, often referred to by doctors as
the Technical University of Denmark and diabetes mellitus, describes a group of
colleagues wanted to find out if small babies metabolic diseases in which the person has
show a similar pattern of brain activity and high blood glucose (blood sugar), either
found it to be indeed so, meaning thereby because insulin production is inadequate,
that infants do develop adult-like conscious or because the body’s cells do not respond
quite early in life (Science, 19 April 2013 | properly to insulin, or both. Insulin is
normally produced by beta cells in the
doi: 10.1126/science.1232509).
For their study the researchers pancreas. Basically, there are two types of
recruited 80 babies of different ages - thirty diabetes. In type-1 diabetes the pancreas
5-month-olds, twenty-nine 12-month-olds does not produce insulin; it is also known
and twenty-one 15-month-olds and fitted as insulin-dependent diabetes. In type-2
each one with electrode caps to measure the diabetes, the body does produce insulin but
brain’s electrical activity through the scalp. not enough for proper function or the cells
Next, the babies sat on their mother or in the body are unable to utilise insulin.
father’s lap while watching a screen with a Type-2 diabetes is the most common form
patterned image. For a fraction of a second and almost 90% of all cases of diabetes
(ranging from as brief as 17 milliseconds worldwide are of this type. Daily insulin
up to 300 milliseconds), the researchers injections are the routine for many people
flashed a photo of a face on the screen. The with type-2 diabetes. But they might be
scientists then analysed the babies’ brain able to break free from that daily chore
activity to search for the two-phase pattern with the discovery of a new hormone called
that would indicate consciousness and they betatrophin, which may radically change the
found it. Babies did indeed show a secondary way the disease is treated.
Researchers at the Harvard Stem
spike in brain activity, just like adults. But
Dream 2047, June 2013, Vol. 15 No. 9
Cell Institute (HSCI) in Cambridge,
Massachusetts, USA, have discovered
a hormone that holds promise for a
dramatically more effective treatment of type
2 diabetes. The researchers believe that the
hormone might also have a role in treating
type-1, or juvenile, diabetes. The researchers
– HSCI co-director Doug Melton and
postdoctoral fellow Peng Yi – found that
betatrophin causes the production rate of
insulin-secreting pancreatic beta cells in
mice to increase by as much as 30 times
normal levels (Cell, 25 April 2013 | doi:
10.1016/j.cell.2013.04.008).
According
to the researchers, the new beta cells only
produce insulin when called for by the
body, offering the potential for the natural
regulation of insulin and a great reduction in
the complications associated with diabetes.
If successful in clinical trials, betatrophin
treatment could augment or replace insulin
injections by increasing the number of
internally produced insulin-producing
cells in diabetics. However, the researchers
caution that much work remains to be
done before it could be used as a treatment
in humans. “If all goes well, tests in people
could follow fairly quickly”, said Melton.
When this treatment is eventually used in
people, it could eventually mean that instead
of taking insulin injections three times a day,
a diabetic might take an injection of this
hormone once a week or once a month, or
in the best case maybe even once a year.
Radioactive bacteria
to treat cancer
Pancreatic cancer is among the deadliest
of cancers, with a five-year survival rate of
only 4 per cent. Without treatment, patients
usually die within three to six months.
Pancreatic cancer occurs when uncontrolled
cell growth begins in the pancreas. More
dangerous, or malignant, tumours form
when the cancer cells migrate to other parts
of the body through the blood or lymph
systems. When a tumour successfully
spreads to other parts of the body and grows,
invading and destroying other healthy
tissues, it is said to have metastasised. This
process itself is called metastasis, and the
result is a more serious condition that is very
difficult to treat. Chemotherapy, surgery and
radiotherapy are generally ineffective against
pancreatic cancer, mainly because the disease
has often spread to other organs even before
it is detected.
24
New Horizons
Radioactive bacteria (red) destroy
cancer cells from the inside. (Credit:
Claudia Gravekamp/Albert Einstein
College of Medicine, New York)
Till recently the low survival rate
of pancreatic cancer patients was mainly
because of the disease’s vicious ability to
metastasise, or spread to other parts of the
body. But recently, researchers Ekaterina
Dadachova and Claudia Gravekamp and
their colleagues at Albert Einstein College
of Medicine in New York have succeeded
in halting the spread of pancreatic cancer
using a novel method of delivering radiation
directly to the cancer cells using genetically
modified bacteria. The modified bacteria
infected and killed the cancer cells directly,
while having no effect on healthy tissue. In a
study using mice carrying human tumours,
the researchers were not only able to shrink
the rodent’s primary tumours while sparing
healthy tissue but were also able to kill
cancer cells that had spread throughout the
animals, reducing their number by up to
90% (Proceedings of the National Academy
of Sciences, 22 April 2013 | doi:10.1073/
pnas.1211287110). The researchers used
a weakened strain of the bacteria Listeria
s
le d
c
i
t e
Ar nvit
i
23
monocytogenes labelled with the radioactive
isotope rhenium-188. According to the
researchers, rhenium-188 was chosen because
it emits beta particles, which are very effective
in treating cancer. Beta particles damage the
DNA of cancer cells thereby killing them.
The method combines two special
characteristics of the bacterium and cancer
cells. Listeria monocytogenes is a rod-shaped
bacterium that penetrates the cells of humans
and animals that it infects. Although in its
wild form the bacterium can cause foodborne illness, a healthy person’s immune
system can usually destroy it before any
damage is done. So the weakened bacterium
does not cause any damage to normal
cells. At the same time, cancer cells tend
to suppress the immune reaction to avoid
being destroyed and so cannot destroy the
bacterium. As a result, while the bacterium
is cleared from normal cells by the body’s
immune system within three to five days,
it accumulates in the immunity-suppressed
cancer cells, which makes it an ideal vehicle
to carry radiation-emitting atoms into cancer
cells. This meant that when the radioactive
bacteria are injected, the tumour cells
receive continuous exposure of radiation but
normal cells are spared. The two researchers
decided to coat Listeria with radioactive
antibodies and injected the bacterium into
mice with pancreatic cancer that had spread
to multiple sites. When they injected radiolabelled bacteria into mice with pancreatic
cancer, they found the radioactive bacteria
infected cancer cells but not normal cells.
After several doses, the mice that had
received the radioactive bacteria had 90%
fewer metastases compared with mice that
had received saline or radiation alone.
According to the researchers, with further
improvements, the new approach has the
potential to start a new era in the treatment
of metastatic pancreatic cancer.
Dream 2047
Vigyan Prasar invites original popular science articles for
publication in its monthly science magazine Dream 2047.
At present the magazine has 50,000 subscribers. The article
may be limited to 3,000 words and can be written in
English or Hindi. Regular coloumns on i) Health ii) Recent
developments in science and technology are also welcome.
Honorarium, as per Vigyan Prasar norm, is paid to the
author(s) if the article is accepted for publication. For details
please log-on to www.vigyanprasar.gov.in
Letters to editor
Interesting articles
I am a student of class 10 studying in Sri
Aurobindo Integral School, Addada, Krishna
district, A.P. I have read a few articles in
your magazine Dream 2047. They are really
spectacular and interesting. It is recently
included in our school library. The article
“How the tigers got their stripes” (May 2012)
was really interesting. At a science fiction
conference held at Lucknow, the science fiction
writer Shukdeo Prasad, said that S.F. is not the
flight of imagination. SF must have a scientific
base. It is true. I hope that Vigyan Prasar sails
smoothly and continues to encourage young
scientists of today. I am very thankful to you
for sending this magazine to our school.
P. Harshitha
Class X, Sri Aurobindo Integral E.M. School.
Aravindapuram, Addada
Andhra Pradesh -521390.
An enlightening article
First of all I would like say thanks to the
editorial team for publishing Dr. M.A. Haque’s
informative article “The Third Pole: Must
be Protected” (November 2012). The article
covered a key aspect of the environment. The
author has written this article very critically
and gives an innovative idea about the third
pole (Himalayan region covered with water,
snow and ice), their significance and protection
strategies. The article covered the basic idea
of the Himalaya, its physical and biological
environment, climatic conditions, etc.,
provided the information about the threat to
the third pole due to global warming, and gave
a detailed account about the steps taken by the
government and nongovernment agencies for
the protection of Himalayan regions in Indian
context.
Kuldeep Bauddh
Senior Research Fellow
School for Environmental Sciences
B.B. Ambedkar (Central) University
Raibareli Road, Lucknow-226025
E-mail: kuldeepenvir0811@gmail.com
Brilliant articles
I feel fortunate to receive Dream 2047 monthly.
I liked the articles on gall stones by Dr. Yatish
Agarwal in the March and April issues. They
were really brilliant! My classmates also enjoy
reading articles published in Dream 2047.
Prashant Khare
prashantkhare096@gmail.com
Green nanotechnology
The article “Green nanotechnology, solution for
clean drinking water” by Monika Koul (Dream
2047 May 2013) was excellent and informative.
Thanks for publishing such a good article.
Radhakrishna Prasad
Kerala
Dream 2047, June 2013, Vol. 15 No. 9
VP News
Students’ Leadership through Innovative Thinking
A
one day seminar on Students’ Leadership
through Innovative Thinking was
organised by Vigyan Prasar, Indian
Association of Physics Teachers (IAPT),
and BNV-Anveshika on 23 April 2013 at
National Science Centre, Delhi. 240 senior
students and 58 senior teachers from 53
schools of Delhi and NCR participated in
the program.
Dr
T.
Ramasami,
Secretary,
Department of Science and Technology,
Government of India, was the chief guest. In
his address, Dr Ramasami appreciated efforts
to promote activity-based learning among
teachers and students. In a humorous and
captivating speech, he narrated some of his
own experiments with teaching methodology
and their effectiveness. He mentioned the
main objectives of the INSPIRE programme
and how young researchers can benefit from
such programmes to carry out high-end
research. Dr Ramasami also said that one of
the mandates of DST is to promote learning
of science and promised all possible support
for such activities.
Dr H.C. Verma, Professor, Department
of Physics, IIT Kanpur, delivered his lecture
on ‘Planck’s Radiation Law and wave particle
duality of radiation’. Dr Verma spoke about
how experiments and theory enrich each
other, how efforts to align the theory of
physics with experimental evidence of black
body radiation made Max Planck look for
unconventional explanation and how this led
to the birth of quantum
mechanics.
Shri Rintu Nath,
Scientist E, Vigyan Prasar,
talked about scientific
methodology and role of
innovative experiments
in understanding science.
He reiterated the role of
teachers in motivating
students towards better
appreciation of science
Inauguration of the seminar: Students’ Leadership
and their role in nation
through
Innovative thinking (Sitting from Left: Professor
building.
H
C
Verma, Dr T. Ramasami, Shri Rintu Nath)
Resource persons
at the seminar gave
demonstrations of Conda Effect, Bernoulli’s principle, electrostatic conduction and
induction, differences between conductors
and insulators, existence of electric field in
free space, electrostatic shielding, potential
gradient in electric field, reduction of
field by a dielectric, invisibility of objects,
total internal reflection, diffraction, and
inertia. The audience not only enjoyed the
demonstrations but also interacted with the
resource persons. The participating students
wrote innovative suggestions on each activity,
thus taking lead in innovative thinking.
Three best suggestions will receive awards
for the leadership in innovative thinking.
The program ended with the vote of
Demonstration of innovative experiments
thanks by Mrs Pragya Nopany, coordinator,
in Physics by Mrs Pragya Nopany
BVN-IAPT Anveshika.
and Mrs Sutapa Laha De
Radio science serial review meeting-cum-workshop
V
igyan Prasar (VP), in association
with National Council of Science
and Technology Communication
(NCSTC), New Delhi and All India
Radio (AIR) organised a two-day
regional
meeting-cum-workshop
at CIET, NCERT campus on 7-8
May 2013. VP has been producing
and broadcasting radio serials on
science topics in 19 Indian languages
through 117 radio stations spread
across the country. The purpose of
this meeting was to discuss the new
radio serial Anko ki Kiladi based on
mathematicians, reviewing the past
efforts, assessing the progress and
decide ways to enhance the reach of
L to R, Dr B.P.Singh, Head NCSTC, Dr R.Gopichandran,
Director, Vigyan Prasar, Dr A.Sekhar, All India
Radio,Delhi on the dais during the inaugural session
Dream 2047, June 2013, Vol. 15 No. 9
the radio serials.
The workshop covered the
languages Hindi, English, Punjabi,
Kashmiri, Marathi and Gujarati.
In first day of meeting Dr. R.
Gopichandran, Director, Vigyan
Prasar, welcomed all present and
briefly presented VP’s involvement
with radio. In his keynote address
Dr B.P. Singh, Head, NCSTC, New
Delhi, emphasised that developing
radio serial on mathematics is really
a challenging job because of the
limitation of the medium and nature
of the subject. He urged to the writers
to prepare scripts in such a way that
common man could understand the
22
VP News
subject and link the subject in their day-today activities. Dr A. Shakher, PEx (PP&D),
AIR, New Delhi, talked about the strength
of the media and efforts which are being
taken by All India Radio in this direction. Dr
T.V. Venkateswaran concluded the session by
pointing out some facts which are important
and should be taken care of in developing
radio serials and suggested end of each
episode of the new serial finished with some
puzzle or activity. Shri Kapil Tripathi briefed
the participants about the purpose of the
two-day review meeting-cum-workshop and
made a presentation on the . Vigyan Prasar
Science and Technology Awareness Through
Radio, or VPSTAR programme of VP.
After this, there was a detailed
brainstorming session on the proposed
serial Anko ki Kiladi on mathematicians.
The session was conducted by Smt. Ujjwala
T. Tirkey, Scientist E, NCSTC, New Delhi
and Shri B.K Tyagi, Vigyan Prasar, New
Delhi. All the proposed 26 episodes based
Continued on from 31 (Interview
on the articles published in Dream-2047
were presented and discussed. One proposed
song on Ramanujan was also played. Lots
of suggestions came from the participants
during the discussions which will be
incorporated in the scripts. Several points
in terms of content, format and production
were discussed. During this session sample
scripts was also discussed. Dr R.S. Yadav,
discussed the some issues involved in
production and requested to the writers to
with Anthony James Legget)
in developing countries? What type of
modifications you would suggest for the
betterment of education and teaching?
A.J.L.: I’m not sure that one can
make any generalisation which will cover
India or Brazil on the one hand and Haiti
or the Central African Republic on the
other. But I think that one rather common
feature of education in many developing
countries tends to be an exaggerated respect
for authority (including that of Nobel
laureates!). I think it is crucial that teachers
in such countries feel free to admit that they
don’t know the answer to a question without
fearing that students will lose respect for
them. Also, what is missing in at least some
cases, e.g., in the West African country with
which I am familiar, is very basic technical
skills, and this is something that I feel that
visiting teachers from the developed world
tend to forget − it isn’t much use students
being up with the latest fashions in sociology
of science if they can't repair the electrical
generator when it breaks down!
M.W.: Quantum revolution influenced
approximately all fields of sciences. What are
the limitations of quantum mechanics?
A.J.L.: We don’t know, and much
of my research has been devoted precisely to
trying to design experiments to test this.
M.W.: What do you say about
21
Brainstorming session on
Mathematics serial is going on
makes a script variant, lively and full-length
with limited stock characters.
On the second day, representatives
from All India Radio and resource groups
explained the status of the project and
discussed feedback on the recently concluded
serials on ‘Chemistry’ and ‘Grass-root
Innovations’. The review brought out the
rich variety of innovative formats used by the
various groups. In this session it was agreed
by all the groups that next 26-episode serial
on mathematics may be started from 15 July
2013.
In the meetings it emerged that the
VP’s radio serials are well received in majority
of languages and there is a need for strong
publicity for reaching a larger audience. A
regional workshop for other languages will
be organised in the month of June 2013.
Total 22 participants from different stations
of All India Radio, language groups, writers,
and officials of NCSTC and VP participated
in the workshop.
the future of string theory or superstring
theory?
A.J.L.: Nothing. It is too far from
real-life experiment for me to have an
opinion.
M.W.: Many theoretical physicists
often wished to have more command on
mathematics to do batter physics. Have you
felt this at any juncture?
A.J.L.: Yes, somewhat. But I don’t
think the lack of a better mathematical
education has prevented me doing the really
crucial things I have tried to do.
M.W.: Feynman made a hypothesis
at that time, that fundamental physics will
be much tougher after some years and that a
state of saturation will be dominating reason
that researchers will shift their interests
towards other sciences. To what extent are
you concerned with this statement?
A.J.L.: I suspect that Feynman is
right, in that if and when we get a “Theory
of Everything”, physicists will become
intellectually restless. But I think they will
probably change the questions they are
asking so that the “theory” no longer seems
so satisfying. Alternatively, as is already
happening to an extent, they will try to use
the methods of physics to address problems
in other fields (psychology, economics...).
M.W.: You are a scientist and you have
faith in religions too. According to you, how
do science and religions connect with each
other? Where are the common platforms of
science and religion?
A.J.L.: I am not, in fact, myself
religious, but I see no objection to some of
my colleagues being fervent believers while
remaining practising scientists. The way I
view “religious” statements is as a sort of third
dimension in the space inhabited by the “factvalue” dichotomy, so they do not compete
with the statements made by science.
M.W.: According to you, which type of
important developments and revolutions will
occur in the field of science in near future?
A.J.L.: If I knew, I would be there
already! My best bet would be on a totally
novel approach to the “arrow of time”.
M.W.: What message do you want
to convey to the students and budding
researchers through this magazine?
A.J.L.: Follow your own curiosity,
and don’t be put off if everyone around you
tells you that the answers to the questions you
are asking are obvious or trivial. Remember
Einstein and the equivalence principle:
“Sometimes the really deep questions are so
simple as to seem stupid!”
M.W.: It was very nice to have a
dialogue with you. I’m sure our youth will
be inspired by your thoughts.
Dream 2047, June 2013, Vol. 15 No. 9